1. Department of Economics; Gatton College of Business and Economics; University of Kentucky; Lexington Kentucky
2. National Bureau of Economic Research; Cambridge Massachusetts
3. Institute of Labor Economics (IZA); Bonn Germany
4. Department of Economics; Andrew Young School of Policy Studies; Georgia State University; Atlanta Georgia
5. Healthcore Inc.; Wilmington Delaware
6. Leonard Davis Institute of Health Economics; Philadelphia Pennsylvania
7. Impaq International; Washington District of Columbia